Pete,
That is some range of work, to work down them;
I really like the shape of the first and the grain effect, the straight lines formed really do look good on it. But it's size looks a little overpowered by the height to the base above the surface it sits on and also by the height of the turquoise stack.
The second is reminiscent of a ceramic vase, the long slow middle curve to the sudden undercut and foot, but it carries the burr and grain to the observer instead of hiding it which is important. The lid fits it well enough but seems a little weak. Hard to describe, a little small, not quite bold enough, a bit pale or lacking in strength of colour, I'm not really sure, just one of those feelings I get.
I like the arrangement of the third one, Base, Stones and vase - all the way up to the shoulder, beyond that the inverted curves to the vase top and lid finial clash.
The forth one is just beautiful, the curves of the shape, the colour of the oak, including cracks and knot, through to the lid and it's quirky twig sit well with an earthy feel. To me it sits comfortably in it's own presence.